> It very much depends upon what "deep space" means to you: In this case "outside of the Earth-moon system" is what I mean. As you say, other changes such as o

> It very much depends upon what "deep space" means to you: In this case "outside of the Earth-moon system" is what I mean. As you say, other changes such as out of solar system or into sun will require massive changes in velocity. In most cases "out of their original Low Earth orbit" is a good definition, but unusually, JWST isn't in LEO to start with. Most satellites can be easily or no-cost de-orbited (chuck it into the earth's atmosphere, allow the orbit to decay until same) from LEO, but with the JWST, I would guess that that would also be expensive.